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Know-how protection in TIA Portal: working with a block you cannot open

Diagram of a know-how protected FB showing its visible interface pins around a greyed-out code body, next to a call in FC_Main with an extra parameter added at the call site marked in red as the source of the interface mismatch error

A know-how protected OEM block will not open. What TIA Portal still lets you do with it, why the compile error sits in your call, and how to clear it.

Categories PLC & HMI Tags alarm, compile error, cross reference, firmware, know-how protection, tia portal

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